643076 has 36 divisors (see below), whose sum is σ = 1393308. Its totient is φ = 258048.

The previous prime is 643073. The next prime is 643081. The reversal of 643076 is 670346.

It can be written as a sum of positive squares in 2 ways, for example, as 329476 + 313600 = 574^2 + 560^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3236 + ... + 3428.

It is an arithmetic number, because the mean of its divisors is an integer number (38703).

2⁶⁴³⁰⁷⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643076, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (696654).

643076 is an abundant number, since it is smaller than the sum of its proper divisors (750232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643076 is a wasteful number, since it uses less digits than its factorization.

643076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 643076 is about 801.9201955307. The cubic root of 643076 is about 86.3152303574.

The spelling of 643076 in words is "six hundred forty-three thousand, seventy-six".